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Merged
merged 1 commit into from
Oct 8, 2022
Merged

Remove mir::CastKind::Misc #102675

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99 changes: 89 additions & 10 deletions compiler/rustc_borrowck/src/type_check/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2209,25 +2209,104 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
}
}
}

CastKind::Misc => {
CastKind::IntToInt => {
let ty_from = op.ty(body, tcx);
let cast_ty_from = CastTy::from_ty(ty_from);
let cast_ty_to = CastTy::from_ty(*ty);
// Misc casts are either between floats and ints, or one ptr type to another.
match (cast_ty_from, cast_ty_to) {
(
Some(CastTy::Int(_) | CastTy::Float),
Some(CastTy::Int(_) | CastTy::Float),
)
| (Some(CastTy::Ptr(_) | CastTy::FnPtr), Some(CastTy::Ptr(_))) => (),
(Some(CastTy::Int(_)), Some(CastTy::Int(_))) => (),
_ => {
span_mirbug!(
self,
rvalue,
"Invalid Misc cast {:?} -> {:?}",
"Invalid IntToInt cast {:?} -> {:?}",
ty_from,
ty,
ty
)
}
}
}
CastKind::IntToFloat => {
let ty_from = op.ty(body, tcx);
let cast_ty_from = CastTy::from_ty(ty_from);
let cast_ty_to = CastTy::from_ty(*ty);
match (cast_ty_from, cast_ty_to) {
(Some(CastTy::Int(_)), Some(CastTy::Float)) => (),
_ => {
span_mirbug!(
self,
rvalue,
"Invalid IntToFloat cast {:?} -> {:?}",
ty_from,
ty
)
}
}
}
CastKind::FloatToInt => {
let ty_from = op.ty(body, tcx);
let cast_ty_from = CastTy::from_ty(ty_from);
let cast_ty_to = CastTy::from_ty(*ty);
match (cast_ty_from, cast_ty_to) {
(Some(CastTy::Float), Some(CastTy::Int(_))) => (),
_ => {
span_mirbug!(
self,
rvalue,
"Invalid FloatToInt cast {:?} -> {:?}",
ty_from,
ty
)
}
}
}
CastKind::FloatToFloat => {
let ty_from = op.ty(body, tcx);
let cast_ty_from = CastTy::from_ty(ty_from);
let cast_ty_to = CastTy::from_ty(*ty);
match (cast_ty_from, cast_ty_to) {
(Some(CastTy::Float), Some(CastTy::Float)) => (),
_ => {
span_mirbug!(
self,
rvalue,
"Invalid FloatToFloat cast {:?} -> {:?}",
ty_from,
ty
)
}
}
}
CastKind::FnPtrToPtr => {
let ty_from = op.ty(body, tcx);
let cast_ty_from = CastTy::from_ty(ty_from);
let cast_ty_to = CastTy::from_ty(*ty);
match (cast_ty_from, cast_ty_to) {
(Some(CastTy::FnPtr), Some(CastTy::Ptr(_))) => (),
_ => {
span_mirbug!(
self,
rvalue,
"Invalid FnPtrToPtr cast {:?} -> {:?}",
ty_from,
ty
)
}
}
}
CastKind::PtrToPtr => {
let ty_from = op.ty(body, tcx);
let cast_ty_from = CastTy::from_ty(ty_from);
let cast_ty_to = CastTy::from_ty(*ty);
match (cast_ty_from, cast_ty_to) {
(Some(CastTy::Ptr(_)), Some(CastTy::Ptr(_))) => (),
_ => {
span_mirbug!(
self,
rvalue,
"Invalid PtrToPtr cast {:?} -> {:?}",
ty_from,
ty
)
}
}
Expand Down
7 changes: 6 additions & 1 deletion compiler/rustc_codegen_cranelift/src/base.rs
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Expand Up @@ -633,7 +633,12 @@ fn codegen_stmt<'tcx>(
lval.write_cvalue(fx, operand.cast_pointer_to(to_layout));
}
Rvalue::Cast(
CastKind::Misc
CastKind::IntToInt
| CastKind::FloatToFloat
| CastKind::FloatToInt
| CastKind::IntToFloat
| CastKind::FnPtrToPtr
| CastKind::PtrToPtr
| CastKind::PointerExposeAddress
| CastKind::PointerFromExposedAddress,
ref operand,
Expand Down
11 changes: 10 additions & 1 deletion compiler/rustc_codegen_cranelift/src/constant.rs
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Expand Up @@ -490,7 +490,16 @@ pub(crate) fn mir_operand_get_const_val<'tcx>(
match &stmt.kind {
StatementKind::Assign(local_and_rvalue) if &local_and_rvalue.0 == place => {
match &local_and_rvalue.1 {
Rvalue::Cast(CastKind::Misc, operand, ty) => {
Rvalue::Cast(
CastKind::IntToInt
| CastKind::FloatToFloat
| CastKind::FloatToInt
| CastKind::IntToFloat
| CastKind::FnPtrToPtr
| CastKind::PtrToPtr,
operand,
ty,
) => {
if computed_const_val.is_some() {
return None; // local assigned twice
}
Expand Down
10 changes: 8 additions & 2 deletions compiler/rustc_codegen_ssa/src/mir/rvalue.rs
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Expand Up @@ -250,7 +250,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
OperandValue::Pair(lldata, llextra)
}
mir::CastKind::Pointer(PointerCast::MutToConstPointer)
| mir::CastKind::Misc
| mir::CastKind::PtrToPtr
if bx.cx().is_backend_scalar_pair(operand.layout) =>
{
if let OperandValue::Pair(data_ptr, meta) = operand.val {
Expand Down Expand Up @@ -290,7 +290,13 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
mir::CastKind::Pointer(
PointerCast::MutToConstPointer | PointerCast::ArrayToPointer,
)
| mir::CastKind::Misc
| mir::CastKind::IntToInt
| mir::CastKind::FloatToInt
| mir::CastKind::FloatToFloat
| mir::CastKind::IntToFloat
| mir::CastKind::PtrToPtr
| mir::CastKind::FnPtrToPtr

// Since int2ptr can have arbitrary integer types as input (so we have to do
// sign extension and all that), it is currently best handled in the same code
// path as the other integer-to-X casts.
Expand Down
4 changes: 2 additions & 2 deletions compiler/rustc_const_eval/src/interpret/cast.rs
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Expand Up @@ -42,8 +42,8 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
let res = self.pointer_from_exposed_address_cast(&src, cast_ty)?;
self.write_immediate(res, dest)?;
}

Misc => {
// FIXME: We shouldn't use `misc_cast` for these but handle them separately.
IntToInt | FloatToInt | FloatToFloat | IntToFloat | FnPtrToPtr | PtrToPtr => {
let src = self.read_immediate(src)?;
let res = self.misc_cast(&src, cast_ty)?;
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Please add a FIXME here indicating that we shouldn't have a single misc_cast for all of them, but handle them separately.

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I can do that once this get's merged. 👍

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Please add the FIXME now, even if you plan to fix it immediately in a follow-up. :)

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But I already did :D

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Ah good, I misunderstood your comment then. :)

self.write_immediate(res, dest)?;
Expand Down
2 changes: 1 addition & 1 deletion compiler/rustc_const_eval/src/transform/check_consts/check.rs
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Expand Up @@ -553,7 +553,7 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
unimplemented!()
}

Rvalue::Cast(CastKind::Misc, _, _) => {}
Rvalue::Cast(_, _, _) => {}

Rvalue::NullaryOp(NullOp::SizeOf | NullOp::AlignOf, _) => {}
Rvalue::ShallowInitBox(_, _) => {}
Expand Down
16 changes: 8 additions & 8 deletions compiler/rustc_const_eval/src/transform/validate.rs
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Expand Up @@ -557,7 +557,14 @@ impl<'a, 'tcx> Visitor<'tcx> for TypeChecker<'a, 'tcx> {
}
Rvalue::Cast(kind, operand, target_type) => {
match kind {
CastKind::Misc => {
CastKind::DynStar => {
// FIXME(dyn-star): make sure nothing needs to be done here.
}
// Nothing to check here
CastKind::PointerFromExposedAddress
| CastKind::PointerExposeAddress
| CastKind::Pointer(_) => {}
_ => {
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We should check that the types are as expected here (leaving out CastKind::Pointer(_) might be fine). This will probably need some deduplication with the typeck code

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I am not sure what to check 😅 , with new function mir_cast_kind we already report a bug with any unexpected cast, and since we built Rvalues with that new function is a check really needed?

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Yes, because MIR validation doesn't just run after MIR is built, but also after transformations that modify it

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I think I modified those too, but it's better to be safe than sorry will add the checks in the next PR.

let op_ty = operand.ty(self.body, self.tcx);
if op_ty.is_enum() {
self.fail(
Expand All @@ -568,13 +575,6 @@ impl<'a, 'tcx> Visitor<'tcx> for TypeChecker<'a, 'tcx> {
);
}
}
CastKind::DynStar => {
// FIXME(dyn-star): make sure nothing needs to be done here.
}
// Nothing to check here
CastKind::PointerFromExposedAddress
| CastKind::PointerExposeAddress
| CastKind::Pointer(_) => {}
}
}
Rvalue::Repeat(_, _)
Expand Down
9 changes: 8 additions & 1 deletion compiler/rustc_middle/src/mir/mod.rs
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Expand Up @@ -1834,7 +1834,14 @@ impl<'tcx> Rvalue<'tcx> {
| Rvalue::AddressOf(_, _)
| Rvalue::Len(_)
| Rvalue::Cast(
CastKind::Misc | CastKind::Pointer(_) | CastKind::PointerFromExposedAddress,
CastKind::IntToInt
| CastKind::FloatToInt
| CastKind::FloatToFloat
| CastKind::IntToFloat
| CastKind::FnPtrToPtr
| CastKind::PtrToPtr
| CastKind::Pointer(_)
| CastKind::PointerFromExposedAddress,
_,
_,
)
Expand Down
8 changes: 6 additions & 2 deletions compiler/rustc_middle/src/mir/syntax.rs
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Expand Up @@ -1149,8 +1149,12 @@ pub enum CastKind {
Pointer(PointerCast),
/// Cast into a dyn* object.
DynStar,
/// Remaining unclassified casts.
Misc,
IntToInt,
FloatToInt,
FloatToFloat,
IntToFloat,
PtrToPtr,
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Non-blocking request from the peanut gallery: It's not obvious to me how PtrToPtr differs from things in Pointer(_). Could you please put some doc-comments on the new variants?

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"FIXME: Pointer(_) is legacy code and should be removed. Please submit a PR if you feel inclined." 🙃

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I haven't investigated the behavior of Pointer(_) but old code did it like the below, and some Ptr to Ptr casts went through CastKind::Misc e.g code in src/test/ui/simd/intrinsic/ptr-cast.rs. However, I could also investigate what Pointer(_) is actually doing in the next PR.

(_, _) => CastKind::Misc,

FnPtrToPtr,
}

#[derive(Clone, Debug, PartialEq, Eq, TyEncodable, TyDecodable, Hash, HashStable)]
Expand Down
26 changes: 26 additions & 0 deletions compiler/rustc_middle/src/ty/cast.rs
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Expand Up @@ -2,6 +2,7 @@
// typeck and codegen.

use crate::ty::{self, Ty};
use rustc_middle::mir;

use rustc_macros::HashStable;

Expand Down Expand Up @@ -75,3 +76,28 @@ impl<'tcx> CastTy<'tcx> {
}
}
}

/// Returns `mir::CastKind` from the given parameters.
pub fn mir_cast_kind<'tcx>(from_ty: Ty<'tcx>, cast_ty: Ty<'tcx>) -> mir::CastKind {
let from = CastTy::from_ty(from_ty);
let cast = CastTy::from_ty(cast_ty);
let cast_kind = match (from, cast) {
(Some(CastTy::Ptr(_) | CastTy::FnPtr), Some(CastTy::Int(_))) => {
mir::CastKind::PointerExposeAddress
}
(Some(CastTy::Int(_)), Some(CastTy::Ptr(_))) => mir::CastKind::PointerFromExposedAddress,
(_, Some(CastTy::DynStar)) => mir::CastKind::DynStar,
(Some(CastTy::Int(_)), Some(CastTy::Int(_))) => mir::CastKind::IntToInt,
(Some(CastTy::FnPtr), Some(CastTy::Ptr(_))) => mir::CastKind::FnPtrToPtr,

(Some(CastTy::Float), Some(CastTy::Int(_))) => mir::CastKind::FloatToInt,
(Some(CastTy::Int(_)), Some(CastTy::Float)) => mir::CastKind::IntToFloat,
(Some(CastTy::Float), Some(CastTy::Float)) => mir::CastKind::FloatToFloat,
(Some(CastTy::Ptr(_)), Some(CastTy::Ptr(_))) => mir::CastKind::PtrToPtr,

(_, _) => {
bug!("Attempting to cast non-castable types {:?} and {:?}", from_ty, cast_ty)
}
};
cast_kind
}
13 changes: 2 additions & 11 deletions compiler/rustc_mir_build/src/build/expr/as_rvalue.rs
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Expand Up @@ -12,7 +12,7 @@ use rustc_middle::mir::AssertKind;
use rustc_middle::mir::Place;
use rustc_middle::mir::*;
use rustc_middle::thir::*;
use rustc_middle::ty::cast::CastTy;
use rustc_middle::ty::cast::{mir_cast_kind, CastTy};
use rustc_middle::ty::{self, Ty, UpvarSubsts};
use rustc_span::Span;

Expand Down Expand Up @@ -217,16 +217,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
let from_ty = CastTy::from_ty(ty);
let cast_ty = CastTy::from_ty(expr.ty);
debug!("ExprKind::Cast from_ty={from_ty:?}, cast_ty={:?}/{cast_ty:?}", expr.ty,);
let cast_kind = match (from_ty, cast_ty) {
(Some(CastTy::Ptr(_) | CastTy::FnPtr), Some(CastTy::Int(_))) => {
CastKind::PointerExposeAddress
}
(Some(CastTy::Int(_)), Some(CastTy::Ptr(_))) => {
CastKind::PointerFromExposedAddress
}
(_, Some(CastTy::DynStar)) => CastKind::DynStar,
(_, _) => CastKind::Misc,
};
let cast_kind = mir_cast_kind(ty, expr.ty);
block.and(Rvalue::Cast(cast_kind, source, expr.ty))
}
ExprKind::Pointer { cast, source } => {
Expand Down
3 changes: 2 additions & 1 deletion compiler/rustc_mir_dataflow/src/elaborate_drops.rs
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Expand Up @@ -823,9 +823,10 @@ where
// tmp = &raw mut P;
// cur = tmp as *mut T;
// end = Offset(cur, len);
let mir_cast_kind = ty::cast::mir_cast_kind(iter_ty, tmp_ty);
vec![
self.assign(tmp, Rvalue::AddressOf(Mutability::Mut, self.place)),
self.assign(cur, Rvalue::Cast(CastKind::Misc, Operand::Move(tmp), iter_ty)),
self.assign(cur, Rvalue::Cast(mir_cast_kind, Operand::Move(tmp), iter_ty)),
self.assign(
length_or_end,
Rvalue::BinaryOp(
Expand Down
4 changes: 2 additions & 2 deletions src/test/mir-opt/const_prop/cast.main.ConstProp.diff
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Expand Up @@ -14,10 +14,10 @@

bb0: {
StorageLive(_1); // scope 0 at $DIR/cast.rs:+1:9: +1:10
- _1 = const 42_u8 as u32 (Misc); // scope 0 at $DIR/cast.rs:+1:13: +1:24
- _1 = const 42_u8 as u32 (IntToInt); // scope 0 at $DIR/cast.rs:+1:13: +1:24
+ _1 = const 42_u32; // scope 0 at $DIR/cast.rs:+1:13: +1:24
StorageLive(_2); // scope 1 at $DIR/cast.rs:+3:9: +3:10
- _2 = const 42_u32 as u8 (Misc); // scope 1 at $DIR/cast.rs:+3:13: +3:24
- _2 = const 42_u32 as u8 (IntToInt); // scope 1 at $DIR/cast.rs:+3:13: +3:24
+ _2 = const 42_u8; // scope 1 at $DIR/cast.rs:+3:13: +3:24
_0 = const (); // scope 0 at $DIR/cast.rs:+0:11: +4:2
StorageDead(_2); // scope 1 at $DIR/cast.rs:+4:1: +4:2
Expand Down
2 changes: 1 addition & 1 deletion src/test/mir-opt/const_prop/indirect.main.ConstProp.diff
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Expand Up @@ -13,7 +13,7 @@
bb0: {
StorageLive(_1); // scope 0 at $DIR/indirect.rs:+1:9: +1:10
StorageLive(_2); // scope 0 at $DIR/indirect.rs:+1:13: +1:25
- _2 = const 2_u32 as u8 (Misc); // scope 0 at $DIR/indirect.rs:+1:13: +1:25
- _2 = const 2_u32 as u8 (IntToInt); // scope 0 at $DIR/indirect.rs:+1:13: +1:25
- _3 = CheckedAdd(_2, const 1_u8); // scope 0 at $DIR/indirect.rs:+1:13: +1:29
- assert(!move (_3.1: bool), "attempt to compute `{} + {}`, which would overflow", move _2, const 1_u8) -> bb1; // scope 0 at $DIR/indirect.rs:+1:13: +1:29
+ _2 = const 2_u8; // scope 0 at $DIR/indirect.rs:+1:13: +1:25
Expand Down
2 changes: 1 addition & 1 deletion src/test/mir-opt/enum_cast.bar.mir_map.0.mir
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Expand Up @@ -7,7 +7,7 @@ fn bar(_1: Bar) -> usize {

bb0: {
_2 = discriminant(_1); // scope 0 at $DIR/enum_cast.rs:+1:5: +1:17
_0 = move _2 as usize (Misc); // scope 0 at $DIR/enum_cast.rs:+1:5: +1:17
_0 = move _2 as usize (IntToInt); // scope 0 at $DIR/enum_cast.rs:+1:5: +1:17
return; // scope 0 at $DIR/enum_cast.rs:+2:2: +2:2
}
}
2 changes: 1 addition & 1 deletion src/test/mir-opt/enum_cast.boo.mir_map.0.mir
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Expand Up @@ -7,7 +7,7 @@ fn boo(_1: Boo) -> usize {

bb0: {
_2 = discriminant(_1); // scope 0 at $DIR/enum_cast.rs:+1:5: +1:17
_0 = move _2 as usize (Misc); // scope 0 at $DIR/enum_cast.rs:+1:5: +1:17
_0 = move _2 as usize (IntToInt); // scope 0 at $DIR/enum_cast.rs:+1:5: +1:17
return; // scope 0 at $DIR/enum_cast.rs:+2:2: +2:2
}
}
2 changes: 1 addition & 1 deletion src/test/mir-opt/enum_cast.droppy.mir_map.0.mir
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Expand Up @@ -26,7 +26,7 @@ fn droppy() -> () {
FakeRead(ForLet(None), _2); // scope 0 at $DIR/enum_cast.rs:+2:13: +2:14
StorageLive(_3); // scope 3 at $DIR/enum_cast.rs:+5:13: +5:14
_4 = discriminant(_2); // scope 3 at $DIR/enum_cast.rs:+5:17: +5:27
_3 = move _4 as usize (Misc); // scope 3 at $DIR/enum_cast.rs:+5:17: +5:27
_3 = move _4 as usize (IntToInt); // scope 3 at $DIR/enum_cast.rs:+5:17: +5:27
FakeRead(ForLet(None), _3); // scope 3 at $DIR/enum_cast.rs:+5:13: +5:14
_1 = const (); // scope 0 at $DIR/enum_cast.rs:+1:5: +6:6
StorageDead(_3); // scope 1 at $DIR/enum_cast.rs:+6:5: +6:6
Expand Down
2 changes: 1 addition & 1 deletion src/test/mir-opt/enum_cast.foo.mir_map.0.mir
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Expand Up @@ -7,7 +7,7 @@ fn foo(_1: Foo) -> usize {

bb0: {
_2 = discriminant(_1); // scope 0 at $DIR/enum_cast.rs:+1:5: +1:17
_0 = move _2 as usize (Misc); // scope 0 at $DIR/enum_cast.rs:+1:5: +1:17
_0 = move _2 as usize (IntToInt); // scope 0 at $DIR/enum_cast.rs:+1:5: +1:17
return; // scope 0 at $DIR/enum_cast.rs:+2:2: +2:2
}
}
2 changes: 1 addition & 1 deletion src/test/mir-opt/funky_arms.float_to_exponential_common.ConstProp.diff
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Expand Up @@ -91,7 +91,7 @@
StorageLive(_15); // scope 3 at $DIR/funky_arms.rs:+15:59: +15:75
StorageLive(_16); // scope 3 at $DIR/funky_arms.rs:+15:59: +15:68
_16 = _10; // scope 3 at $DIR/funky_arms.rs:+15:59: +15:68
_15 = move _16 as u32 (Misc); // scope 3 at $DIR/funky_arms.rs:+15:59: +15:75
_15 = move _16 as u32 (IntToInt); // scope 3 at $DIR/funky_arms.rs:+15:59: +15:75
StorageDead(_16); // scope 3 at $DIR/funky_arms.rs:+15:74: +15:75
_14 = Add(move _15, const 1_u32); // scope 3 at $DIR/funky_arms.rs:+15:59: +15:79
StorageDead(_15); // scope 3 at $DIR/funky_arms.rs:+15:78: +15:79
Expand Down
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